import { buildImportPath, getBasename } from '../builder';
import { BaseUrl } from '../options/baseUrl';
import { Logger } from '../options/logger';
import { SemicolonCharacter } from '../options/noSemicolon';
import { QuoteCharacter } from '../options/quoteCharacter';
import { Directory } from '../interfaces/directory.interface';
import { FileTreeLocation } from '../interfaces/location.interface';

import {execSync} from "child_process";


export function buildFlatBarrel(
  directory: Directory,
  modules: FileTreeLocation[],
  quoteCharacter: QuoteCharacter,
  semicolonCharacter: SemicolonCharacter,
  logger: Logger,
  baseUrl: BaseUrl,
  exportDefault: boolean
): string {

  return modules.reduce((previous: string, current: FileTreeLocation) => {

    const importPath = buildImportPath(directory, current, baseUrl);

    logger.debug(`Including path ${importPath}`);

    if (exportDefault) {

      try {

        execSync('grep "export default" ' + current.path);

        logger.debug(`Default export found in ${importPath}`);


          const filename = getBasename(current.path);
        previous += `export { default as ${filename} } from ${quoteCharacter}${importPath}${quoteCharacter}${semicolonCharacter}
`;
      } catch (error) {

        logger.debug(`No default export was found in ${importPath}`);

      }

    }
    return (previous += `export * from ${quoteCharacter}${importPath}${quoteCharacter}${semicolonCharacter}
`);
  }, '');
}